Everything is Turning to White

Emma Potter moved away without a word after the war, and everyone feared she might be dead. Ginny Weasleys managed to find her though, and bring Emma out of the woodworks when a time machine in need of testing. Emma now is in the past with a mission to save everyone who died and stop Voldemort from rising. There is also the mystery about the Vannah Luto. Fem!Harry! Time travel!